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RESEARCH PAPERS

Exergy Costs and Inefficiency Diagnosis of a Dual-Purpose Power and Desalination Plant

[+] Author and Article Information
J. Uche

CIRCE Foundation (Center of Research for Energy Resources and Consumptions), University of Zaragoza, c/María de Luna 3, 50018 Zaragoza, Spainjaviuche@unizar.es

L. Serra

CIRCE Foundation (Center of Research for Energy Resources and Consumptions), University of Zaragoza, c/María de Luna 3, 50018 Zaragoza, Spainjaviuche@unizar.es

A. Valero

CIRCE Foundation (Center of Research for Energy Resources and Consumptions), University of Zaragoza, c/María de Luna 3, 50018 Zaragoza, Spainjaviuche@unizar.es

J. Energy Resour. Technol 128(3), 186-193 (Jul 08, 2005) (8 pages) doi:10.1115/1.2213276 History: Received February 28, 2005; Revised July 08, 2005

Two applications of the thermoeconomic analysis technique have been performed to an interesting and complex system, which is an integrated dual plant composed of a steam power plant and a multi-stage desalination plant. A complete exergy and thermoeconomic costs analysis of different plant performances and the diagnosis of inefficiencies in a plant component are discussed in this paper. The results show that the knowledge of the physical cost of the two products of the plant and also the intermediate costs of every plant flowstream are essential to manage the plant in the best feasible condition. The inefficiency diagnosis computes the penalties of those inefficiencies, translates them into economical charges, and allows unexpected relationships between different plant components to be discovered.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Physical model of the steam power plant of a dual-purpose plant

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Figure 2

FP definition for the dual-purpose power plant devices

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Figure 3

Fuel/product diagram (productive structure) of the dual-purpose power and desalination plant

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Figure 4

Fuel/product diagram (productive structure) in case the steam turbine is off and only desalted water is produced

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Figure 5

Total impact on fuel depending on the degree of inefficiency applied to the HPT4

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